Astronomers, both
professional and hobbyist, find the Light Writer LED pen the perfect
pen for recording their observations. The RED LED light has
a very minimal effect on the dilation of the iris, allowing
the astronomer to record observations without requiring
periods of time for their eyes to readjust.

The high quality of pen, and
the capability to turn off the LED when not required makes
the Light Writer the perfect multi-purpose pen for anyone
spending their time gazing at the stars.